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When you pick up the cards the first time it puts the volunteer’s card in the middle 7 of the pack. Then the cards are dealt again, and those 7 are split up further with 2 in the first pile, 3 in the middle, and 2 in the last pile. That narrows it down to 2 or 3 cards. The last deal splits those 2/3 into different piles, and by picking up the cards correctly you have put the volunteer’s card into the middle of the middle of the middle of the pack.
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